Joh Henschel | South African Environmental Observation Network (original) (raw)

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Papers by Joh Henschel

Research paper thumbnail of Coexistence of Ammoxenus (Gnaphosidae) spider species on and between termitaria of Microhodotermes viator (Hodotermitidae) at a Karoo site

African Entomology, Dec 19, 2023

Research paper thumbnail of Phylogeny of sand termites

Biodiversity and Ecology, Nov 13, 2022

Research paper thumbnail of Prey selection by spotted hyaena (Crocuta crocuta) in the Namib Desert

Research paper thumbnail of Reproduction of sand termites and local genetic patterns

Biodiversity and Ecology, Nov 13, 2022

Research paper thumbnail of Age determination and age structure of a striped fieldmouse,Rhabdomys pumilio, population from the Cape Flats

South African Journal of Zoology, 1982

Research paper thumbnail of Bauble spiders: a new species of<i>Achaearanea</i>(Araneae: Theridiidae) with ingenious spiral retreats

Journal of Natural History, Dec 1, 1994

ABSTRACT A new species of Achaearanea (Theridiidae) is described from the Cedarberg in South Afri... more ABSTRACT A new species of Achaearanea (Theridiidae) is described from the Cedarberg in South Africa. Its unusual morphological features include the position of the spinnerets directly behind the epigastric fold. The male palp is a modification of the palpal conformation of other Achaearanea. This spider lives in a spherical retreat comprizing silk, sand and pebbles. This structure typically dangles from only one thread and has a tiny opening at the bottom that leads into a spirally-coiled tunnel. Males and females build spirals in opposite directions. This enables the male to construct his retreat against that of the female in such a way as to form a brood chamber. Retreats are situated in cool places under low overhanging rocks or branches. The configuration of the narrow, suspended retreat may decrease the spider&#39;s vulnerability to enemies while foraging for ants in a typical theridiid fashion.

Research paper thumbnail of Not one but several: Morphological diversity within the sand termite

Biodiversity and Ecology, Nov 13, 2022

Research paper thumbnail of The development of a marine fouling community in relation to the primary film of microorganisms

Biofouling, Feb 1, 1990

The role of primary film formation in the colonisation of substrata by marine invertebrates was i... more The role of primary film formation in the colonisation of substrata by marine invertebrates was investigated in experiments conducted in waters of the Western Cape, South Africa. Surface‐bound antibiotics and herbicides were used to reduce proliferation of bacteria and diatoms respectively on test panels, while the primary film was enriched on other panels before exposure to the sea. The colonisation

Research paper thumbnail of Aspects of marine fouling in western Cape waters

Research paper thumbnail of Mean height increase in saplings of a keystone woody savanna species over 15 years similar to that over a single season

Research paper thumbnail of Ecohydrology and root architecture of Welwitschia mirabilis in the hyperarid Namib Desert

Research paper thumbnail of Territorial Behaviour by a Clan of Spotted Hyaenas Crocuta crocuta

Research paper thumbnail of Parturition and early maternal care of spotted hyaenasCrocuta crocuta: a case report

Journal of Zoology, Dec 1, 1990

Research paper thumbnail of Bone-collecting habits of spotted hyaenas<i>Crocuta crocuta</i>in the Kruger National Park

South African Journal of Zoology, 1986

Research paper thumbnail of North-South cooperation through BIOTA: an interdisciplinary monitoring programme in arid and semi-arid southern Africa

Research paper thumbnail of The brown locust refocussed - Knowns, unknowns and the relevance of Locustana pardalina (Walker) to Karoo ecosystems and rangeland management

Journal of Arid Environments

Research paper thumbnail of Where birds are rare or fill the air: Documenting Karoo complexity: Richard Dean (10 August 1940—3 August 2022)

Journal of Arid Environments

Research paper thumbnail of Animals

Biodiversity & Ecology

This section introduces important animals that are not regarded as causing fairy circles. It is r... more This section introduces important animals that are not regarded as causing fairy circles. It is rather assumed that they take advantage of resources and structures provided by fairy circles. Some of them directly use the Sand termites as a food resource (e.g. Aardvark), others occupy various positions within food webs at fairy circles (e.g. Seothyra spiders feeding on Tetramorium ants which forage on Psammotermes). Others seem to simply make use of the soil moisture offered underneath the fairy circles bare patch (e.g. the ant Carebara kunenesis). Namibian mountain zebra often use the open areas of the bare patch for dust bathing by rolling. Ostrich may also use fairy circles for dust bathing and sometimes establish nests inside.

Research paper thumbnail of Water Relations of a Welwitschia Mirabilis Community Threatened by Mining in the Namib-Naukluft National Park, Namibia

Research paper thumbnail of Drought as a driver of vegetation change in Succulent Karoo rangelands, South Africa

African Journal of Range & Forage Science, 2022

Research paper thumbnail of Coexistence of Ammoxenus (Gnaphosidae) spider species on and between termitaria of Microhodotermes viator (Hodotermitidae) at a Karoo site

African Entomology, Dec 19, 2023

Research paper thumbnail of Phylogeny of sand termites

Biodiversity and Ecology, Nov 13, 2022

Research paper thumbnail of Prey selection by spotted hyaena (Crocuta crocuta) in the Namib Desert

Research paper thumbnail of Reproduction of sand termites and local genetic patterns

Biodiversity and Ecology, Nov 13, 2022

Research paper thumbnail of Age determination and age structure of a striped fieldmouse,Rhabdomys pumilio, population from the Cape Flats

South African Journal of Zoology, 1982

Research paper thumbnail of Bauble spiders: a new species of<i>Achaearanea</i>(Araneae: Theridiidae) with ingenious spiral retreats

Journal of Natural History, Dec 1, 1994

ABSTRACT A new species of Achaearanea (Theridiidae) is described from the Cedarberg in South Afri... more ABSTRACT A new species of Achaearanea (Theridiidae) is described from the Cedarberg in South Africa. Its unusual morphological features include the position of the spinnerets directly behind the epigastric fold. The male palp is a modification of the palpal conformation of other Achaearanea. This spider lives in a spherical retreat comprizing silk, sand and pebbles. This structure typically dangles from only one thread and has a tiny opening at the bottom that leads into a spirally-coiled tunnel. Males and females build spirals in opposite directions. This enables the male to construct his retreat against that of the female in such a way as to form a brood chamber. Retreats are situated in cool places under low overhanging rocks or branches. The configuration of the narrow, suspended retreat may decrease the spider&#39;s vulnerability to enemies while foraging for ants in a typical theridiid fashion.

Research paper thumbnail of Not one but several: Morphological diversity within the sand termite

Biodiversity and Ecology, Nov 13, 2022

Research paper thumbnail of The development of a marine fouling community in relation to the primary film of microorganisms

Biofouling, Feb 1, 1990

The role of primary film formation in the colonisation of substrata by marine invertebrates was i... more The role of primary film formation in the colonisation of substrata by marine invertebrates was investigated in experiments conducted in waters of the Western Cape, South Africa. Surface‐bound antibiotics and herbicides were used to reduce proliferation of bacteria and diatoms respectively on test panels, while the primary film was enriched on other panels before exposure to the sea. The colonisation

Research paper thumbnail of Aspects of marine fouling in western Cape waters

Research paper thumbnail of Mean height increase in saplings of a keystone woody savanna species over 15 years similar to that over a single season

Research paper thumbnail of Ecohydrology and root architecture of Welwitschia mirabilis in the hyperarid Namib Desert

Research paper thumbnail of Territorial Behaviour by a Clan of Spotted Hyaenas Crocuta crocuta

Research paper thumbnail of Parturition and early maternal care of spotted hyaenasCrocuta crocuta: a case report

Journal of Zoology, Dec 1, 1990

Research paper thumbnail of Bone-collecting habits of spotted hyaenas<i>Crocuta crocuta</i>in the Kruger National Park

South African Journal of Zoology, 1986

Research paper thumbnail of North-South cooperation through BIOTA: an interdisciplinary monitoring programme in arid and semi-arid southern Africa

Research paper thumbnail of The brown locust refocussed - Knowns, unknowns and the relevance of Locustana pardalina (Walker) to Karoo ecosystems and rangeland management

Journal of Arid Environments

Research paper thumbnail of Where birds are rare or fill the air: Documenting Karoo complexity: Richard Dean (10 August 1940—3 August 2022)

Journal of Arid Environments

Research paper thumbnail of Animals

Biodiversity & Ecology

This section introduces important animals that are not regarded as causing fairy circles. It is r... more This section introduces important animals that are not regarded as causing fairy circles. It is rather assumed that they take advantage of resources and structures provided by fairy circles. Some of them directly use the Sand termites as a food resource (e.g. Aardvark), others occupy various positions within food webs at fairy circles (e.g. Seothyra spiders feeding on Tetramorium ants which forage on Psammotermes). Others seem to simply make use of the soil moisture offered underneath the fairy circles bare patch (e.g. the ant Carebara kunenesis). Namibian mountain zebra often use the open areas of the bare patch for dust bathing by rolling. Ostrich may also use fairy circles for dust bathing and sometimes establish nests inside.

Research paper thumbnail of Water Relations of a Welwitschia Mirabilis Community Threatened by Mining in the Namib-Naukluft National Park, Namibia

Research paper thumbnail of Drought as a driver of vegetation change in Succulent Karoo rangelands, South Africa

African Journal of Range & Forage Science, 2022

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